Research Concerning the Predictive Evaluation of the Motor Moment at the Crankshaft of the Conventional Sucker Rod Pumping Units

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In the kinetostatic study of the mechanism of the sucker rod pumping units, the cinematic motion parameters of the elements are considered to be known, assuming that the cranks have a constant angular velocity imposed by the operating functioning conditions of the pumping unit. The paper analyzes the dynamic response of the mechanism of these pumping units, which implies the determination of the variation of the angular acceleration of the cranks during the operating cinematic cycle. A series of results regarding the determination of the variation of the angular acceleration of the cranks during the cinematic cycle in the case of the mechanism of a C-640D-305-120 pumping unit are presented. The obtained results are checked by comparing the experimental curves of variations of the acceleration at the polished rod with those obtained by simulation using a computer program developed by the authors in which the angular acceleration of the cranks was taken into consideration. Keywords: sucker rod pumping unit, dynamic response, angular acceleration of the cranksEstablishing the variation of the angular acceleration of the cranks of the conventional sucker rod pumping units, which implies the determination of their dynamic response, is particularly important in assessing the operation of the entire pumping installation [1][2][3]. Obtaining high values of the angular acceleration of the cranks would reveal inadequate operation of the pumping unit, due to a poor balancing of the unit mechanism or due to the dynamics of the sucker rod string [4][5][6][7].The paper presents the way to determine the variation on the cinematic cycle of the acceleration of the cranks of the conventional pumping units by using the synthesis parameters of the dynamic model of their mechanism. The results obtained in the case of a C-640D-305-120 pumping unit were verified by comparing the experimental curves of the variation of the acceleration of the polished rod with those obtained by simulation using a computer program developed by the authors in which the angular acceleration of the cranks was taken into consideration. Total Well Management program [11] has been used for processing the experimental records and the computer program for simulations was developed with Maple programming environment [10]. Experimental partThe experimental records have been obtained from a well serviced by a C-640D-305-120 pumping unit manufactured by Lufkin [12] and were processed with the program Total Well Management [11]. For establishing the variation of the angular acceleration of the cranks were used the records concerning the variation of the force at the polished rod and of the motor moment at the crankshaft for the strokes 90 ( fig. 1) and 95 (fig. 2). *

Section: Abstract: Sucker Rod Pumping Unit Dynamic Response Angularmentioning

confidence: 99%

Analysis of the Dynamic Response of the Mechanism of Conventional Sucker rod Pumping Units

Badoiu¹,

Toma²

2020

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“…7. The mechanism of the conventional pumping units (4) (5) where: m 1 , m 2 and m 3 represents the mass of the cranks, connecting rods and of the rocker, respectively, and J C1 , J C2 , and J C3 , are their mass moments of inertia calculated relative to their centers of mass; M g red is the reduced moment corresponding to the weight forces of the component elements of the mechanism of the conventional pumping units and M f red is the reduced moment corresponding to the force F acting at the end of the polished rod ( fig. 7).…”

Section: Experimental Partmentioning

confidence: 99%

“…The analysis of the conventional pumping installations in order to improve their operation requires the completion of complex studies both on the level of the sucker rods pumping column and also concerning the surface equipment, especially the pumping unit mechanism [1][2][3][4][5][6][7][8]. Regarding the mechanism of the pumping units, from the perspective of their dynamics, the study of the movement equation is extremely important for highlighting the dynamic response to the motor and resistant actions on the component elements [9][10].…”

mentioning

confidence: 99%

Research Concerning the Movement Equation of the Mechanism of the Conventional Sucker Rod Pumping Units

Badoiu¹

2019

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Establishing and then solving the movement equation of the mechanism of the conventional sucker rod pumping units allows determining the variation on the cinematic cycle of the angular speed of the cranks as a dynamic response to the motor and resistant actions on the component elements. The evaluation as accurate as possible of the dynamic response depends on a more precise determination of the variation on the cinematic cycle of the synthesis parameters that occur in the movement equation of the mechanism of the pumping units. In the paper is established the movement equation of the mechanism of the conventional pumping units and are presented a series of results regarding the variation on the cinematic cycle of some synthesis parameters in the case of the mechanism of a C-640D-305-120 pumping unit. Experimental records have been processed with the Total Well Management program and the simulations have been performed with a computer program developed by the author using the Maple programming environment.

“…The analysis of the sucker rod pumping installations in the perspective of their functional optimization requires an accurate determination of the parameters that characterize the operation of the pumping unit mechanism and those corresponding to the movement of the sucker rod column [1][2][3]. On the other hand, especially the analysis of their dynamics is extremely laborious and requires a large amount of calculations due to the constructive complexity of the component structural elements of the pumping unit mechanism and due to the complex loads that appear during the movement of the sucker rod column [4][5][6][7][8]. Therefore, expressing in a simplified but sufficiently precise form the various cinematic and dynamic parameters that characterize the proper functioning of the sucker rod pumping installations is extremely useful in analyzing the possibilities of their functional optimization.…”

mentioning

confidence: 99%

Research Concerning the Use of Polynomial Functions in the Study of the Conventional Sucker Rod Pumping Units

Badoiu¹

2019

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The analysis of the conventional sucker rod pumping units and especially their dynamics is laborious and requires a large amount of calculations due to the constructive complexity of the component structural elements. Therefore, expressing in a simplified but sufficiently precise form the various cinematic and dynamic parameters that characterize the proper functioning of the pumping units is extremely useful in analyzing the possibilities of their functional optimization. In the paper are presented a series of results concerning the expressing of some cinematic and dynamic parameters using polynomial functions in the case of the mechanism of a C-640D-305-120 pumping unit. The simulations have been performed with a computer program developed by the author using Maple programming environment. Experimental records processing was performed with the program Total Well Management.